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  4. CVE 2026 107846 bitcoinjs lib undetected merkle node duplication
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Back to active CVEs
Critical · CVSS 9.3CVE-2026-107846

bitcoinjs-lib: Undetected merkle node duplication in block root computation validates a forged transaction listCVE-2026-107846

Answer in brief

CVE-2026-107846 records a Critical severity (CVSS 9.3) vulnerability in bitcoinjs-lib: Undetected merkle node duplication in block root computation validates a forged transaction list. The current sources do not mark it as known exploited. The current feed maps bitcoinjs/bitcoinjs-lib (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 4, 2026Updated Nov 4, 2026Source checked Nov 4, 2026First seen by HOL Nov 4, 2026Material review Nov 4, 2026
Upstream Advisory

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-354
Source
CVE List V5
Source checked
Nov 4, 2026
References
4 linked sources
Open source record

Key facts

Risk
Critical · CVSS 9.3
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 9.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps bitcoinjs/bitcoinjs-lib (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
bitcoinjs/bitcoinjs-libgeneric>=2.3.0 <5.2.1 || >=6.0.0 <6.1.8 || >=7.0.0-rc.0 <7.0.25.2.1, 6.1.8, 7.0.2

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for bitcoinjs/bitcoinjs-lib.
  2. 2Review the reported fix. Update bitcoinjs/bitcoinjs-lib to 5.2.1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 4, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 4, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 4, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

bitcoinjs-lib is a JavaScript Bitcoin library for Node.js and browsers. From 2.3.0 until 5.2.1, 6.1.8, and 7.0.2, fastMerkleRoot pads odd Merkle-tree levels by hashing the final node with itself but does not report adjacent duplicate hashes. The affected block-root verifier was introduced as Block.checkMerkleRoot() alongside Block.calculateMerkleRoot(), while later versions expose validation through checkTxRoots() and __checkMerkleRoot; these validation paths can accept a recomputed root without checking for mutation. A peer can append duplicate transactions so a different transaction list retains the original Merkle root, block header, proof of work, and block identifier. Consumers that rely on block-root validation, including explorers, exchange indexers, or SPV clients, can process a duplicated transaction twice or blacklist the shared block hash and reject the honest block. This issue is fixed in versions 5.2.1, 6.1.8, and 7.0.2.

Quoted source text, attributed separately from HOL analysis.